Cadant C3 CMTSCable Modem Termination System
C3 CMTS User Documentation
Documentation SetRelease 4.4, Standard October 2006
ARRIS PROPRIETARY This document contains proprietary information
of ARRIS, Inc. and is not to be disclosed or used except in
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Reserved 10/25/06
Copyright and Trademark Information Cadant C3 Cadant C4 Keystone
D5 ARRIS and Arris Interactive are trademarks of ARRIS
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manufacturing methods, or other circumstances may warrant. The
ARRIS Cadant C3 Cable Modem Termination System (CMTS) has been
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ARRIS shall be relieved of all obligations and liability under the
Warranty provisions set forth herein, if:
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The Hardware or Software is operated with, or the error or
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or act of God.
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jurisdiction and venue thereof. 17. Safety Information for ARRIS
Touchstone Products ARRIS telephony modems and cable modems comply
with the applicable requirements for performance, construction,
labeling, and information when used as outlined in this Section 17:
17.1 Caution: Only a professional installer may connect the
telephony modem to the homes existing telephone wiring. Physical
connections to the previous telephone provider must be removed and
the wiring must be checked; there must not be any voltages.
Cancellation of telephone service is not sufficient to ensure there
is no power to the telephony modem. Failure to do so may result in
loss of service and/or permanent damage to the telephony modem.
17.2 Do not use the product near water (e.g., wet basement,
bathtub, sink or near a swimming pool), to avoid risk of
electrocution. 2006 ARRIS All rights reserved.
17.3 Avoid using and/or connecting the equipment during an
electrical storm, to avoid risk of electrocution. 17.4 Do not
locate the product within 6 feet (2 m) of a flame or ignition
source, to avoid damage or injury from battery explosion, or heat
damage. 17.5 Use only the power supply and/or power cord included
with the Product. Install the Product near and easily accessible to
the power outlet. Ground the RF drop cables shield at the
building/residence either close to the point of entrance or at the
point of attachment. Grounding as close as practical to the
building/residence AC ground is required to minimize grounding
connector length and thereby limit the potential voltage
differences between the cable TV coaxial cable and other grounding
system. Refer to the individual countrys National Electric Code for
further details. 17.6 In areas of high AC power surge events or
poor AC power grounding situations and areas prone to lightning
strikes additional AC power surge protection may be required on the
AC, RF, Ethernet, USB and phone lines. 17.7 If connecting the
telephony modem or cable modem to a local computer through the
Ethernet or USB cable the computer must be properly grounded to the
building/residence AC ground network. All plug-in cards within the
computer must be properly installed and grounded to the computer
frame per the manufacturers specifications.
2006 ARRIS All rights reserved.
2006 ARRIS All rights reserved.
Table of Contents
1
About this ManualScope In this Document Conventions Used in This
Manual For More Information FCC Statement Safety 1-1 1-2 1-3 1-4
1-4 1-4
2
Getting StartedAbout the C3 CMTS Fast Start Introducing the
ARRIS Cadant C3 CMTS Major Components of the Cadant C3 CMTS 2-1 2-2
2-2 2-8
3
CMTS InstallationPlanning the Installation 3-1
4
Bridge OperationTerms and Abbreviations Bridging Features Bridge
Concepts Bridge Binding IP Addressing Attaching Bridge Groups
Incoming Traffic Allocation to a Sub-Interface 4-2 4-3 4-4 4-14
4-16 4-18 4-19
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5
Providing Multiple ISP AccessOpen Access Cable-VPN
Implementation Using the Modem IP Address to allocate CPE to a VPN
Using a Modem Configuration File to Allocate CPEs to a VPN 5-1 5-3
5-5 5-12
6
IP RoutingRouting Concepts About RIP About OSPF Loopback
Interfaces Multicast Operations Layer 3 Multicast Operation Routing
Command Overview OSPF Point-To-Multipoint OSPF User interface
Route-Maps Match Clauses Provisioning Route-Maps Displaying
Route-maps OSPF Route Redistribution Filtering 6-1 6-3 6-3 6-8 6-9
6-12 6-13 6-14 6-16 6-17 6-19 6-20 6-20 6-21
7
Managing Cable ModemsChanging the Upstream Channel Type DHCP
Data Errors Provisioning Upstream Load Balancing 7-3 7-3 7-23
7-24
8
Configuring SecurityOverview Physically Separating Data
Filtering Traffic Cable Interface VLANS 8-2 8-3 8-7 8-27
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Cable Source Verify Packet Throttling Broadcast Throttling IP
Throttling Simple Law Enforcement Monitoring (SLEM) Configuring SSH
Authentication, Authorization, and Accounting (AAA) AAA Feature AAA
Method List Operation CLI Infrastructure AAA Authentication
Commands AAA Authorization Commands AAA Accounting Commands TACACS+
Commands
8-32 8-34 8-35 8-35 8-36 8-39 8-44 8-44 8-52 8-53 8-55 8-56 8-58
8-60
9
Service ProceduresRemoving Power for Servicing Resetting the
Power Supplies Replacing a Power Supply Fan Tray Replacement
Replacing the Battery Replacing the RF Card Replacing Fuses
Upgrading the CMTS Software Enabling Licensing Features Upgrading
Dual Upstream Receivers (DOCSIS 2.0 Systems) 9-2 9-3 9-4 9-5 9-5
9-8 9-9 9-10 9-17 9-19
10
PacketCable Multimedia (PCMM)PacketCable Multimedia Overview
PCMM Core Functionality COPS Communication Layer PCMM Messages PCMM
Gate Database PCMM Gate Transactions 10-1 10-2 10-3 10-4 10-5
10-6
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Gate Database Synchronization with Policy Server Debugging and
Logging PCMM Timers CLI Commands Common CLI Commands Debug Commands
Show Commands
10-6 10-7 10-7 10-10 10-10 10-11 10-12
11
Command Line Interface ReferenceUser Mode Commands User Mode
SHOW Commands Privileged Mode Commands Privileged SHOW Commands
Global Configuration Commands Configure-keychain Mode Configure
Line Mode Interface Configuration Commands Router Configuration
Mode 11-6 11-15 11-31 11-54 11-117 11-219 11-222 11-224 11-315
List of CLI Commands A SpecificationsProduct Specifications
A-1
B
CMTS Configuration ExamplesC3 CMTS Install DebugWhat to Do if
DHCP is Not Working Simple Bridging Simple Bridging with Separate
Management Traffic Bridging, Separate Management Traffic, CM and
CPE DHCP Servers B-2 B-5 B-6 B-8 B-11
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Advanced Bridging Simple IP Routing Network Routing, Separate
Management Traffic Hybrid operation
B-13 B-23 B-24 B-26
C
Wireless Cable ApplicationsOverview Feature Summary
Configuration User Interface SNMP C-1 C-2 C-2 C-3 C-4
D
DS1 ApplicationsProvisioning Summary Example Modulation Profile
Example Cable Modem Configuration File D-2 D-2 D-3
E F
SLEM MIB Quality of Service (QoS)Introduction Best Effort QoS
Docsis 1.1 token bucket Fairness implementation Priority
implementation Downstream non-unicast traffic Upstream request
opportunities Channel overhead Downstream overhead Upstream
overhead Channel configuration changes Admissions Downstream
admission Upstream admission F-1 F-2 F-2 F-2 F-3 F-4 F-5 F-6 F-6
F-7 F-9 F-10 F-10 F-10
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Controlling bunching Dominant interval SCDMA frames Debugging
admission Customization via configuration Rate limiting Admission
capacity Over-subscription Priority parameter usage
Downstream-specific configuration Upstream-specific configuration
Common traffic types Upstream single modem throughput UDP TCP Voice
DS1/T1 Cellular backhaul IP video QoS capabilities Admission
capacity Utilization Grant/Poll intervals Grant/Poll jitters Modem
configuration file contents Static voice packet flow Static voice
packet flow with SIP snooping Dynamic voice packet flow with
secondary signaling flow Dynamic voice packet flow with primary
signaling flow DS1 configuration
F-10 F-10 F-11 F-12 F-14 F-14 F-14 F-14 F-15 F-15 F-16 F-17 F-17
F-18 F-18 F-19 F-22 F-22 F-23 F-24 F-24 F-24 F-24 F-25 F-25 F-25
F-26 F-27 F-28 F-28
G
Factory DefaultsDefault Configuration Listing Default Modulation
Profiles G-2 G-19
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H
Configuration FormsFastethernet 0/0 Configuration Fastethernet
0/1 Configuration Cable Configuration H-3 H-4 H-6
I
C3 CMTS Syslog Events and SNMP TrapsSyslog Events SNMP Traps I-1
I-9
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List of Figures
2
Getting StartedFigure 2-1: Figure 2-2: Figure 2-3: Major
components of the C3 CMTS Front panel of C3 CMTS Rear panel port
identification 2-5 2-5 2-7
3
CMTS InstallationFigure 3-1: Figure 3-2: Figure 3-3: Figure 3-4:
Figure 3-5: Figure 3-6: Figure 3-7: Figure 3-8: Earthing using only
DC power Example positioning of the M4 nut and lock washers
Connector and pin locations Example of CATV System Connections CMTS
rear view LCD location Rear panel connectors Rear cable connections
3-2 3-3 3-4 3-6 3-8 3-9 3-11 3-21
4
Bridge OperationFigure 4-1: Figure 4-2: Figure 4-3: Figure 4-4:
Figure 4-5: Figure 4-6: Example of a bridge group Example of a
sub-interface to access different bridge groups Example of a
Management Access Only interface Illustration of the default bridge
configuration Illustration of the factory default configuration
Example of a bridging network configuration 4-4 4-5 4-6 4-7 4-8
4-9
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List of Figures
C3 CMTS
Figure 4-7: Figure 4-8: Figure 4-9:
Data flow when FastEthernet 0/1 is the boot interface Default,
V2.0 compatible, operating mode Example of Bridge group 0
4-11 4-12 4-13 4-13 4-14 4-15 4-16 4-17 4-19 4-22 4-23
Figure 4-10: Example of Bridge group 1 Figure 4-11: Example of
CMTS management traffic Figure 4-12: Bridge binding on US Layer 2
broadcast Figure 4-13: Example of legal use of the bridge bind
command Figure 4-14: Example of IP addressing Figure 4-15: Example
of attaching bridge groups Figure 4-16: Example of ARRIS VSE with a
VPN ID of 000Bh Figure 4-17: Example configuration file with VSE
information
5
Providing Multiple ISP AccessFigure 5-1: Figure 5-2: Figure 5-3:
Figure 5-4: Figure 5-5: Figure 5-6: Example of an Open Access
system Example network diagram Bridging data flow through the C3
CMTS Diagram of network used in this example How the C3 CMTS
bridges data in the example How the C3 CMTS bridges data in this
configuration 5-2 5-6 5-7 5-12 5-13 5-18
6
IP RoutingFigure 6-1: Figure 6-2: OSPF two-level hierarchy
Example of an OSPF-based network redistributing RIP routes 6-6
6-7
7
Managing Cable ModemsFigure 7-1: Figure 7-2: DHCP traffic flow
through the C3 CMTS in transparent mode DHCP traffic flow with
dhcp-giaddr enabled 7-4 7-15
8
Configuring SecurityFigure 8-1: Simplified network diagram
8-20
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List of Figures
Figure 8-2: Figure 8-3: Figure 8-4: Figure 8-5:
Example of bridging traffic to the FastEthernet RFC 3924
framework AAA Security Model Method list example
8-25 8-37 8-45 8-52
9
Service ProceduresFigure 9-1: Figure 9-2: Figure 9-3: Figure
9-4: Figure 9-5: Figure 9-6: Figure 9-7: Figure 9-8: Figure 9-9:
Front panel latch Front panel faceplate Resetting power supplies
Power supply Fan tray Location of battery on CPU card Removing the
CPU card Replacing the RF card Fuse location 9-2 9-2 9-3 9-4 9-5
9-6 9-7 9-8 9-9 9-13 9-19 9-20 9-21 9-22
Figure 9-10: Location of compact flash Figure 9-11: IF cable
routing Figure 9-12: Adding a MAC/PHY card Figure 9-13: Securing
the dual receiver board Figure 9-14: Fully populated MAC/PHY
card
10
PacketCable Multimedia (PCMM)Figure 10-1: Network Diagram of
PCMM Implementation 10-3
B
CMTS Configuration ExamplesFigure B-1: Figure B-2: Figure B-3:
Figure B-4: Figure B-5: Simple configuration Default allocation of
sub-interfaces to the default bridge groups Example of bridge-group
capabilities Example of how an ISP based DHCP server manages CPE IP
addresses Example of all the C3 CMTS vs. advanced bridging and VLAN
abilities B-2 B-7 B-9 B-12 B-14
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List of Figures
C3 CMTS
Figure B-6: Figure B-7: Figure B-8: Figure B-9:
Example of open access without using 802.1Q backbone VLANs
Example of a pure routing model Example of the equivalent routing
version of simple bridging Example of a hybrid operation
B-20 B-23 B-25 B-27
F
Quality of Service (QoS)Figure F-1: Initial offset of 1.6
F-11
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1
About this Manual
TopicsScope In this Document Conventions Used in This Manual For
More Information FCC Statement Safety
Page1 2 3 4 4 4
ScopeThis document provides necessary procedures to install,
operate, and troubleshoot the ARRIS Cadant C3 CMTS in a DOCSIS- or
EuroDOCSIScompatible environment. It is intended for cable
operators and system administrators who configure and operate the
CMTS. It is assumed the reader is familiar with day-to-day
operation and maintenance functions in networks that rely on TCP/IP
protocols and hybrid fiber/coax (HFC) cable networks. This document
applies to version 4.4 of the CMTS software, including minor
revisions and point releases. This software is compatible with
DOCSIS/EuroDOCSIS 1.1 C3 CMTS hardware with Dual Upstream Receiver
Modules that have 3138 silicon and DOCSIS/EuroDOCSIS 2.0 C3 CMTS
hardware with Dual Upstream Receiver Modules that have 3140 A1 or
3140 A3 (internal or external A/D) silicon.
Release 4.4, Standard
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1-1
1 About this Manual
In this DocumentThis manual provides the following content:
Chapter 2, Getting Started, provides a brief overview of the Cadant
C3 CMTS and its components. Chapter 3, CMTS Installation, describes
how to unpack and install the CMTS including how to bring up the
CMTS from an out of box condition to full operation. Chapter 4,
Bridge Operation, describes basic bridge operation of the CMTS and
issues in upgrading to L3 capable code to restore DHCP operation.
Chapter 5, Providing Multiple ISP Access, describes the supported
802.1Q VLAN capabilities. Chapter 6, IP Routing, describes how to
configure the C3 CMTS as a layer 3 router. Chapter 7, Managing
Cable Modems, describes common procedures for operating and
troubleshooting DOCSIS systems. Chapter 8, Configuring Security,
describes methods that can be used to improve security of
management and user traffic. Chapter 9, Service Procedures,
describes basic service procedures. Chapter 10, PacketCable
Multimedia (PCMM), describes the PCMM functionality available on
the C3 CMTS. Chapter 11, Command Line Interface Reference,
describes the command line interface for managing and configuring
the CMTS. Appendix A, Specifications, lists physical, electrical,
and networking specifications. Appendix B, CMTS Configuration
Examples, provides a configuration for a bench top trial. Includes
both RF and CLI configuration. Appendix C, Wireless Cable
Applications, describes features related to wireless cable support.
Appendix D, DS1 Applications, provides example configurations for
providing circuit emulation services. Appendix E, SLEM MIB,
provides the Simple Law Enforcement Monitoring (SLEM) MIB. Appendix
F, Quality of Service (QoS), describes QoS provisioning
information. Appendix G, Factory Defaults, contains default
configuration information. Appendix H, Configuration Forms,
provides a form listing essential configuration parameters.
Appendix I, C3 CMTS Syslog Events and SNMP Traps, provides a
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listing of supported traps and syslog events.
Conventions Used in This ManualVarious fonts and symbols are
used in this manual to differentiate text that is displayed by an
interface and text that is selected or input by the user:
Highlight bold
Use Keyword: Text to be typed literally at a CLI prompt.
Indicates a required user parameter. A parameter enclosed in
[square] brackets is optional; a parameter enclosed in {curly}
brackets is mandatory. Display text. Shows an interactive session
of commands and resulting output. IP address: enter an IP address
in dotted-quad format MAC address: enter a MAC address as three
4-digit hexadecimal numbers, separated by periods.
Examples Type exit at the prompt. ping {ipaddr}
italics
A parameter in a CLI command. ping {ipaddr} bracketed terminal
[no] monitor
monospaced
ipaddr
10.1.105.128
macaddr
00a0.731e.3f84
NOTE Notes are intended to highlight additional references or
general information related to a procedure, product, or system.
CAUTION
Caution: Indicates an action that may disrupt service if not
performed properly.
WARNINGDanger: Indicates an action that may cause equipment
damage, physical injury, or death if not performed properly.
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1 About this Manual
For More InformationFor more detailed information about DOCSIS,
refer to the following technical specifications, available online
at www.cablelabs.com. Radio Frequency Interface (RFI)
Specificationdefines how data is passed over the cable Operations
Support System Interface (OSSI) Specificationdefines how DOCSIS
components can be managed by the cable operator Baseline Privacy
Interface (BPI) Specificationdefines how data is encrypted while
traveling on the cable to keep it private Computer to Modem
Communications Interface (CMCI) Specificationdefines how PCs can
communicate to cable modems
For an overview of DOCSIS 2.0 features, see the ARRIS white
paper Getting to Know the New Kid on the Block at
http://www.arrisi.com/products_solutions/applications/white_papers/DOCSIS_20_Getting_To_Know_The_New_Kid.pdf
FCC StatementThis device complies with part 15 of the FCC Rules.
Any changes or modifications not expressly approved by the grantee
of this device could void the users authority to operate the
equipment.
SafetyNormal lightning and surge protection measures are assumed
to have been followed in the RF plant that the ARRIS Cadant C3 CMTS
RF input and output is connected to. If AC supply is used to power
the ARRIS Cadant C3 CMTS, suitable surge and lightning protection
measures should be taken with this supply. The equipment rack the
ARRIS Cadant C3 CMTS is mounted in should have a separate safety
ground connection. This ground should be wired in accordance with
National Electric Code (NEC) requirements for domestic applications
and paragraph 2.6 of EN60950/IE950 for international applications.
The safety ground wire must be #6 AWG or larger, and it must
connect the equipment rack directly to the single-point ground in
the service panel. The single-point ground can be an isolated
ground or the AC equipment ground in the service panel or
transformer. Depending on the distances between the cabinets and
the location of the service panel, the wiring can be either
daisy-chained through the cabinets or run independently from each
cabinet to the service panel.
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The remaining non-RF and non-AC supply connections of the ARRIS
Cadant C3 CMTS should be made by SELV rated circuits.
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Getting Started
TopicsAbout the C3 CMTS Fast Start Introducing the ARRIS Cadant
C3 CMTS Major Components of the Cadant C3 CMTS
Page1 2 2 8
This chapter introduces the ARRIS Cadant C3 Cable Modem
Termination System (CMTS) and provides background information about
the DataOver-Cable Service Interface Specification (DOCSIS)
standards with which the product complies.
About the C3 CMTSARRIS has designed the C3 CMTS specifically for
DOCSIS and EuroDOCSIS specifications. From its inception, it has
been designed to take advantage of already defined Advanced
Physical Layer features as well as new noise suppression
technologies to deliver the most efficient utilization of the
upstream spectrum. The hardware platform itself has been designed
to scale to the most demanding needs of the operator from a packet
classification and features perspective. The processing power of
the system is capable of accommodating the emerging needs of cable
operators worldwide.
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With dual RISC processors in its architecture, the C3 CMTS
supplies the processing power needed to support high volumes of
traffic, with excellent latency control. The CMTS has scalable
transmit and receive capacity, which can be configured to support
one channel downstream and up to six channels upstream. It supports
multiple network protocols, and multiple architectures such as
PPPoE and NetBEUI, making it easy to add to existing router- or
switch-based cable networks. Easy-to-use system management tools
include an industry-standard command-line interface. DOCSIS
Compliance The C3 CMTS is DOCSIS 1.1, DOCSIS 2.0, and EuroDOCSIS
1.1 qualified. A EuroDOCSIS-2.0 based operation is supported when
used with the DOCSIS 2.0 RF card. The C3 CMTS works on any cable
system with any DOCSIS compliant or EuroDOCSIS based modems.
Fast StartThe basics of commissioning the Cadant C3 CMTS are
covered in Chapter 3 and a complete example of a bench top
installation is also provided in Appendix B.
Introducing the ARRIS Cadant C3 CMTSThe C3 CMTS is a flexible,
powerful, and easy-to-use Cable Modem Termination System (CMTS). It
is DOCSIS 1.1, DOCSIS 2.0, and EuroDOCSIS 1.1 qualified and
compliant with EuroDOCSIS 2.0 standards, which includes
specifications for features such as security enhancements,
telephony, QoS, and tiered services. The C3 CMTS has dual
10/100/1000 Mbps Ethernet interfaces and supports a 64 or 256
Quadrature Amplitude Modulation (QAM) cable TV downstream channel,
and up to six variable-rate Quadrature Phase Shift Keying (QPSK) or
8, 16, 32, or 64 QAM upstream channels. Easy-to-use system
management tools include an industry-standard command-line
interface.
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Table 2-1: C3 CMTS Features and Benefits Features Advanced TDMA
support: 8QAM, 32QAM, and 64QAM 200 KHz to 6.4 MHz channel width
Benefits Designed from the ground up to support advanced
symmetrical data rate applications based on the DOCSIS 1.0, 1.1,
and 2.0 specifications while maintaining compatibility with
existing modems. Delivers superior performance in real-world cable
plants through advanced noise cancellation technology Full DOCSIS
1.1 with ATDMA support, or DOCSIS 2.0 with ATDMA and SCDMA support,
in a one-rack unit high system Allows operators to choose the
routing method most appropriate to their needs Up to 30 ACLs with
30 entries per ACL may be applied to any interface Allows better
utilization of upstream frequency space for DOCSIS in plants
outside of North America
Compact size Operator selectable Layer 2 and Layer 3 forwarding
ACL support Full upstream support 5 to 65 MHz
DOCSIS and Provides flexibility for operators by supporting
EuroDOCSIS support either protocol on the same unit with no
selectable in software additional hardware to purchase PacketCable
Multimedia (PCMM) COPS DQoS Efficient bandwidth management
Integrated RF upconverter PacketCable Multimedia COPS DQoS
capability will be supported. (Note: there will be no support in
this release for RADIUS messaging to the RKS or IPsec.)
Load-balancing allows the cable operator to automatically or
manually distribute upstream traffic evenly across available
channels. Complete ready-to-use CMTS in only one rack unit (1.75
in. of space)
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Table 2-1: C3 CMTS Features and Benefits Features Benefits
Provides support for up to 200 simultaneous telephony connections.
DOCSIS DSx signalling occurs directly between the C3 CMTS and an
MTA. DSx messages can Add (DSA), Change, (DSC) or Delete (DSD)
service flows dynamically. DSx support The C3 CMTS currently
supports CPE-initiated DSx transactions. For voice traffic, DSx is
used to create UGS flows upstream on the fly. Unlike BE flows, data
rates of UGS flows are guaranteed by the CMTS. In the Downstream
direction, DSx is used to create flows with a Minimum reserved
rate. Once established, these flows take priority over all others
in the Downstream direction. SIP signalling can be used to provide
voice services using legacy CPE that does not support DOCSIS DSx.
SIP Dynamic Polling dynamically creates upstream and downstream
data flows for voice traffic; as with DSx, these flows have
priority over DOCSIS BE data flows. When the voice call terminates,
the bandwidth used by these flows is freed for use by other voice
or data traffic. To enable this feature, configure the Cable Modem
at the customer premises with a special configuration file. When
the C3 CMTS detects appropriate SIP messages coming from the Cable
Modem, the C3 CMTS activates prioritized flows to carry the voice
traffic. Contact your ARRIS Technical Support representative if you
require more information on this feature.
SIP Dynamic Polling
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The following diagram shows the major components of the Cadant
C3 CMTS.MAC & PHY Blade WAN & CPU Blade Aux WAN
(reserverd)
Upconverter BladeFantray PCB
cPCI Midplane
Power Midplane Upconverter Midplane Front Pane Extension
Card
PSU1
PSU2
Front Panel Display
Figure 2-1: Major components of the C3 CMTS Front panel The
following diagram shows the C3 CMTS front panel.
NS FA
0 1 2 3 4 5 RX RX RX RX RX RX
X 0 1 AU FE FE
UP
N O C
US U1 U2 AT PS PS ST
LCD
Figure 2-2: Front panel of C3 CMTS
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The following table lists and describes the front panel
indicators. Table 2-2: Front panel indicators Name FANS RX0 to RX5
AUX FE 0 FE 1 UP CON Green Flashing Green Green Flashing Green
Green Off Green Flashing Red PSU 2 Green Flashing Red Flashing
Amber STATUS Green Flashing Red RF test Traffic LED flash rates
Indication Green Red Flashing Red Green Flashing Green Description
Normal operation. One fan has failed. More than one fan has failed.
Upstream is active. Upstream is in use. not used WAN network port
is linked. WAN network port is active. MGMT network port is linked.
MGMT network port is active. Upconverter is operating properly.
Upconverter not installed. Power supply 1 (on the left side behind
the front panel) is operating properly. Power supply 1 fault
detected. Power supply 2 (on the right side behind the front panel)
is operating properly. Power supply 2 fault detected. CMTS is
booting. Normal operation. CMTS fault detected. Downstream output
with signal level attenuated by 30 dB
PSU 1
The Traffic LED flashes at variable rates to indicate the
relative amount of data flowing through the CMTS. The following
table interprets the LED flash rate. Table 2-3: LED flash rates
Traffic Rate >2000 packets per second >1000 packets per
second >500 packets per second Flash Rate 50 milliseconds 100
milliseconds 150 milliseconds
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Table 2-3: LED flash rates Traffic Rate >300 packets per
second >100 packets per second >10 packets per second less
than 10 packets per second 0 packets per second Rear Panel Flash
Rate 200 milliseconds 250 milliseconds 300 milliseconds 500
milliseconds not flashing
The following diagram shows the locations of ports on the rear
panel.
DOCSIS 1.X C3 CMTSDebug LEDs Serial Alarm Compact Flash FE1 FE0
DC power AC power
Cable 1/0 Downstream
Cable 1/0 Upstreams 0-5
Downstream IF
F2 F1 Fuses -
DOCSIS 2.X C3 CMTSCable 1/0 Downstream Debug LEDs Serial Alarm
Compact Flash FE1 FE0 DC power AC power
Cable 1/0 Upstreams 0-5
TST Downstream F2 F1 CLK OUT IF Fuses -
Figure 2-3: Rear panel port identification
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The following table describes the ports on the rear panel. Table
2-4: Rear panel ports Port FE1 FE0 AC power DC power RS232 Alarm
RX0 RX1 RX2 RX3 RX4 RX5 Downstream TST CLK OUT Interface
10/100/1000Base-T interface 10/100/1000Base-T interface Input
receptacle for 90 to 264 volts AC Input receptacle for 40 to 60
volt DC RS-232 serial port for initial setup (38400/N/8/1) Reserved
for future use. Upstream #1 (cable upstream 0) Upstream #2 (cable
upstream 1) Upstream #3 (cable upstream 2) Upstream #4 (cable
upstream 3) Upstream #5 (cable upstream 4) Upstream #6 (cable
upstream 5) Downstream output from upconverter 10.24 MHz sync clock
output. (DOCSIS 2.x C3 CMTS only) This port is off by default and
not required for normal operation.
Intermediate frequency (IF) output (43.75 MHz for NA Downstream
IF DOCSIS; 36.125 MHz for EuroDOCSIS) which may be Output routed to
an external upconverter.
NOTE ARRIS does not support simultaneous use of the Downstream
and Downstream IF outputs.
Major Components of the Cadant C3 CMTSRedundant Power Supplies
The Cadant C3 CMTS supports simultaneous powering from AC or DC
using one or two power supplies. If two power supplies are
installed, the load is shared between both. In this configuration,
one power supply may fail without impacting system operations. The
CMTS has separate connections for AC and DC power. The Cadant C3
CMTS incorporates a state-of-the-art up-converter for the
downstream signal. The signal may be output in either the DOCSIS (6
MHz wideAnnex B) or EuroDOCSIS (8 MHz wideAnnex A) formats. The
inte-
Up-Converter
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grated up-converter can generate the full DOCSIS/EuroDOCSIS
power range across the entire frequency. The up-converter is
frequency agile. Either the command line interface or SNMP can be
used to tune the upconverter and configure it for DOCSIS or
EuroDOCSIS operation. The CMTS is capable of using various
frequency plans, including North American Standard, IRC, HRC,
Japanese, European PAL, and European SECAM. For more information on
supported channel plans, see Appendix B. The C3 CMTS can operate at
any frequency (in 62.5 KHz steps) within the band. Wideband Digital
Receiver The CMTS incorporates a wideband digital receiver for each
upstream channel. The digital receiver section allows spectrum
analysis as well as advanced digital signal processing to remove
noise (including ingress) and deliver the highest possible
performance. The MAC chip implements media access control (MAC)
protocol and handles MPEG frames. It also supports Direct Memory
Access (DMA) for high data transfer performance. The CMTS has two
Ethernet interfaces, each which is capable of operating at 10, 100,
or 1000 megabits per second. The ports are capable of both
half-duplex and full-duplex operation and automatically negotiate
to the appropriate setting. One port may be dedicated to data while
the other port may be used for out-of-band management of the C3
CMTS and (optionally) cable modems. The CMTS management mode
determines how traffic is assigned to the Ethernet ports, and may
be selected through the C3 CMTS configuration. For example: CPU C3
CMTS management traffic can be restricted to one Ethernet port, and
all subscriber traffic restricted to the other Ethernet port. Cable
modem traffic can be directed to either Ethernet port as
required.
Media Access Control (MAC) Chip Ethernet Interfaces
Management Schemes
The CMTS is built around dual, state-of-the art, reduced
instruction set (RISC) processors. One processor is dedicated to
data handling while the other processor performs control functions
including SNMP. The C3 CMTS uses a Compact Flash card to store
operating software and configuration files. The disk may be removed
without affecting normal operation; however, the C3 CMTS disables
all configuration-related CLI and SNMP functions until you replace
the disk.
Flash Disk
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3
CMTS Installation
TopicsPlanning the Installation Network Requirements Power
Requirements Earthing Cable Requirements Cable Plant Requirements
Unpacking the CMTS Mounting the CMTS Initial Configuration
Page1 1 2 2 4 5 6 7 10
Use this chapter to install the Cadant C3 CMTS.
Planning the InstallationNetwork Requirements The CMTS may be
connected to your network using one or both Ethernet interfaces. If
it is desired to keep subscriber data traffic physically separate
from management traffic, then both ethernet interfaces must be
used. Alternatively, data and management traffic can be sent on
different VLANS via a single Ethernet interface. Regardless of the
connection method selected, at least one network connection is
required to the CMTS.
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Power Requirements
To assure high system reliability, the C3 CMTS chassis supports
two hotswappable, load-sharing power supply modules. A single
supply can provide all the power that a fully loaded system needs
with sufficient safety margin. Each type of power supply has a
separate power connector mounted on the rear panel of the C3 CMTS
chassis. The power connectors are typically plugged into the AC
power or DC power distribution unit of the rack or cabinet using
the power cords supplied with the C3 CMTS. NOTE Make sure that the
power circuits have sufficient capacity to power the C3 CMTS before
connecting power. To disconnect power from the C3 CMTS for
servicing, remove both power leads (AC and DC) from the rear
socket. The C3 CMTS has no power switch.
Earthing
Reliable earthing of rack mounted equipment should be
maintained. See Safety, page 1-4, for common safety considerations.
Also consider using power strips instead of direct connections to
branch circuits. When using only DC power, earth the C3 CMTS
chassis using the supplied M4 stud.
DC
AC - 110V
Figure 3-1: Earthing using only DC power Use an M4 nut and M4
lock washers with the parts stacked as shown in the example figure
below.
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If using DC power, then the Earthing conductor on the DC power
cable may be secured under either the top nut or the bottom
nut.
Lockwasher
DC Feed Ground
Lockwasher Metal
Chassis Ground
Figure 3-2: Example positioning of the M4 nut and lock washers
AC powering DC powering The AC power modules require 100 to 240
volt, 2A, 47 to 63 Hz AC power. The socket-outlet must be properly
earthed. The DC power modules requires 40 to 60 V DC, 4A power from
a SELV rated source. The DC power source must have an over current
protection device rated at 10 Amp. The external DC cable assembly
must not be modified in the field; route any excess length to avoid
snags. Connect both Feed 1 and Feed 2 to the DC power source even
if only one DC power supply is to be installed. This allows placing
a single DC power supply in either of the two possible locations,
or placing two DC power supplies in the chassis.
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The following diagram shows the connector and pin locations.
DC RETURN BLACK 1 -40 to -60V FEED 2 (RED) 2 -40 to -60V FEED 2
(WHITE) 3
Signal DC Return -40 to -60V Feed 1 -40 to -60V Feed 2
To Pin 1 Pin 2 Pin 3
AWG 18 18 18
Color Black Red White
Figure 3-3: Connector and pin locations Cable Requirements A
variety of cables and connectors and the tools to work with them
must be obtained to complete the installation. Table 3-1: Cable and
connector types Cable Serial console (included with C3 CMTS)
Ethernet connections CATV Wire Type 9 pin RS-232 serial cable
Category 3, 4, 5, or 5E twisted pair cable RG-59 coaxial cable
(all) RG-6 (DOCSIS 2.0 cards only) Connector Type DB-9M RJ-45 F
NOTE Use only RG-59 coaxial cable with DOCSIS 1.1 cards. RG-6
cable is not suitable for use with the connectors on these cards,
but may be used with DOCSIS 2.0 cards.
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Ethernet Connections
The C3 CMTS provides two 10/100/1000BaseT Ethernet ports to
allow connection to a terminating router, server, or other
networking devices such as a hub, switch, or bridge. Both Ethernet
connectors are standard RJ-45 connectors. For 10BaseT and 100BaseT,
unshielded cable may be used. For 1000BaseT, use shielded category
5E wire.
Cable Plant Requirements
The RF cable plant should be designed so that all RF ports
connect to SELV circuits (meeting the requirements of SELV as
defined in UL60950). You must provide suitable protection between
these ports and the CATV outside plant. Table 3-2: Downstream RF
cable plant requirements Parameter Frequency Range Value 88 to 858
MHz (DOCSIS) 112 to 858 MHz (EuroDOCSIS)
Carrier-to-Nose ratio at the 30 dB RF input to the cable modem
Channel bandwidth 6 MHz (DOCSIS) 8 MHz (EuroDOCSIS)
Table 3-3: Upstream RF cable plant requirements Parameter
Frequency Range* Carrier-to-noise ratio at the RF input to the C3
CMTS Channel Bandwidth Value 5 to 42 MHz (DOCSIS) 5 to 55 MHz
(Japan) 5 to 65 MHz (EuroDOCSIS At least 10 dB 200 KHz, 400 KHz,
800 KHz, 1600 KHz, 3200 KHz, 6400 KHz
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CATV System Connections
The C3 CMTS transmitter output is the downstream RF connection
(headend to subscriber). The receiver inputs (subscriber to head
end) are the upstream RF connections. There are 2 upstream
connections per upstream receiver module with a maximum of 6
upstream connections per CMTS.
Figure 3-4: Example of CATV System Connections Unpacking the
CMTS The carton in which the Cadant C3 CMTS is shipped is
specifically designed to protect the equipment from damage. Save
all shipping materials in case the product needs to be returned to
the manufacturer for repair or upgrade. Unpack the equipment
carefully to ensure that no damage is done and none of the contents
is lost. Package Contents The Cadant C3 CMTS package should contain
the following items: Cadant C3 CMTS Rack mounting ears and mounting
screws Power cord Serial console cable Safety and Quick Start
guides
If any of these items are missing, please contact your ARRIS
service representative. Action After unpacking the equipment, but
before powering it up the first time, read this manual in its
entirety, then perform a visual inspection of the equipment as
follows:
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1 Look for the following potential problems: Physical damage to
the chassis or components Loose connectors Loose or missing
hardware Loose wires and power connections
2 If any of the above are found, do not attempt to power on the
CMTS. Contact your local service representative for instructions.
Mounting the CMTS The C3 CMTS is 1.75 in. (4.4 cm) high and is
suitable for mounting in a standard 19 in. (48.3 cm) relay rack.
NOTE Install the CMTS in a restricted access location.
Environmental requirements Installation of the equipment in a rack
should not restrict airflow where marked on the top of the C3 CMTS
case. In particular, provide adequate side clearance. Mount the C3
CMTS properly to prevent uneven mechanical loading on the chassis.
Improper mounting can cause premature failure and potentially
hazardous conditions. When installed in a closed or multi-unit rack
assembly, the operating temperature inside the rack environment may
be higher than ambient temperature. The C3 CMTS should be installed
in an environment where the ambient temperatures remains below 40
Celsius.
Procedure 3-1
Follow these steps to mount the CMTS in a 19-inch rack. 1
Install one rack mounting bracket on each side of the CMTS so that
the two-hole side is closest to the front of the CMTS and the
brackets protrude away from the CMTS. Use four screws to fasten
each bracket to the CMTS. CAUTION
Heavy load. Handle with care.The CMTS weighs approximately 22
lbs (10 Kg). If necessary, have a second person hold the CMTS while
mounting it to the rack. 2 Mount the CMTS in the rack and secure it
using two screws on each side. End of procedure
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Procedure 3-2
Connecting Cables Use this procedure to connect RF, data, and
power cables to the CMTS. Depending on the configuration ordered,
the C3 CMTS may have 2, 4, or 6 upstreams.
CMTS Rear View
Refer to the following figure to locate the cable ports.DC power
Cable 1/0 Downstream FE1 FE0 AC power
Cable 1/0 Upstreams 0-5 -
Figure 3-5: CMTS rear view
Procedure 3-3
Follow these steps to connect cables to the CMTS. 1 Connect the
upstream cable from your plant to the appropriate upstream ports.
The upstream ports are located on the lower board, and are numbered
left to right as viewed from the rear. NOTE Connect all RF ports to
SELV circuits (meeting the requirements of SELV as defined in
UL60950). Your headend must provide suitable protection between the
RF ports and the CATV outside plant. 2 Connect the downstream cable
to the downstream port (the F-connector located at the upper left).
3 Connect a PC to the serial connector (male DB9 connector on the
upper interface module). The pin-out for this connector is designed
to function with a PC when used with a straight-through cable, and
is shown in the following table. The serial port operates at 38,400
bps with 8 data bits, 1 stop bit, and no parity bit. Pin 1 2
Receive Data (RD) Signal Data Carrier Detect (DCD)
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Pin 3 4 5 6 7 8 9
Signal Transmit Data (TD) Data Terminal Ready (DTR) Ground (GND)
Data Set Ready (DSR) Request to Send (RTS) Clear to Send (CTS)
Unused
4 (optional) Connect an Ethernet cable between the FE1 port and
the network manager. 5 Connect an Ethernet cable between the FE0
port and the network bridge or router. 6 Make the power connection
as follows: If using AC power, connect the power cord to the input
socket in the upper right (above the fuses). If using DC power,
connect the supplied DC power cable to the small white connector to
the immediate left of the AC input connector.
NOTE When DC powering, the chassis should be earthed to the rack
using the supplied M4 earthing stud as detailed in Earthing, page
3-2. 7 Apply power to the CMTS. The cooling fans should start to
turn, and the CMTS should display initial startup messages on the
LCD screen on the front panel. The following figure shows the
location of the LCD. End of procedure
LCDNS FA 0 1 2 3 4 5 RX RX RX RX RX RX X 0 1 AU FE FE UP O C N
US U1 U2 AT PS PS ST
LCD
Figure 3-6: LCD location
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Initial Configuration Prerequisites
The following sequence can be used to start up the ARRIS Cadant
C3 CMTS. This startup sequence assumes an out of the box initial
condition. The following items must be set up before configuring
the CMTS: An external DHCP server must be running. An external TFTP
server must contain the cable modem configuration file specified by
the DHCP server.
Optional Items
The following items are optional for the initial configuration,
but may be required for normal operation: A ToD server is available
for the cable modem. An NTP server is available for the CMTS. A
Syslog server is available.
Initial Boot Parameters
Required boot parameters depend on how the C3 CMTS loads its
software image. Table 3-4: Required boot parameters If the software
image is on the C3 CMTS flash disk none booting interface (see
below) an external TFTP server initial IP address of the booting
interface default gateway IP address to the TFTP server the 802.1Q
VLAN ID if booting over an 802.1Q VLAN encoded backbone is required
Required boot parameters are
The choice of the booting interface (fe0/0 or fe0/1) also
pre-defines certain bridging behavior of the CMTS. You can
reconfigure this behavior, but from a factory default condition
before the system loads its code for the first time (or no
startup-configuration on the compact flash disk): Selecting fe0/0
configures in-band behavior. All cable modem and CPE traffic is
directed to fe0/0; you can use either Ethernet port for managing
the CMTS. Selecting fe0/1 configures out-of-band behavior. All CPE
traffic is directed to fe0/0. All cable modem traffic is directed
to fe0/1. You can use either Ethernet port for managing the CMTS if
managementaccess is specified in the interface configuration.
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Factory Default Network Settings
Factory default network settings are: IP address is one of: -
10.1.127.120 - 10.1.127.121 - 10.1.127.122 - 10.1.127.123 Subnet
mask: 255.255.128.0 Gateway address:10.1.0.3
See Appendix G, Factory Defaults for a complete list of factory
default settings. Rear Panel Connectors Refer to the following
diagram when performing this procedure.DC power Serial FE0 AC
power
-
Figure 3-7: Rear panel connectors Perform the following tasks in
the order shown.
Preparing the Connections, page 3-11 Verifying Proper Startup,
page 3-12 Setting Boot Parameters, page 3-13 Configuring an Initial
CLI Account, page 3-16
Procedure 3-4
Preparing the Connections 1 Connect the appropriate AC or DC
power cables to the CMTS. Do not power up yet. 2 Connect the RS232
serial cable to the serial port and connect the other end to a
terminal (or PC with a terminal emulation program).
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3 Start the console application and set the console
configuration to: Port: Com1/Com2, depending on your connection
Baud rate: 38400 Data: 8 bits Parity: None Stop bit: 1 Flow
control: None
End of procedure
Procedure 3-5
Verifying Proper Startup Follow these steps to start the C3 CMTS
for the first time. 1 Power on the CMTS and verify that the
following status LEDs on the front panel are illuminated green:
FANS PSU1 PSU2 (if second power supply is installed) Status
2 Verify that the FE0 and FE1 ports on the back of the CMTS have
illuminated green Link LEDs (for the port that is being used). 3
Wait for the message Press any key to stop auto-boot... to appear
on the console, then press any key to stop auto booting before the
count reaches 0. NOTE Auto booting continues after two seconds. 4
At prompt, type help or ? and press Enter to view the different
commands available for boot options. The first commands you see are
user level commands.CMTS>?
---------------------------------------------------------------Command
Description
---------------------------------------------------------------boot
Boot the CMTS using current boot parameters bootShow Display
current boot parameters enable Enable Supervisor/Factory Level
sysShow Show system configuration timeShow Displays current Date
and Time from RTC
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dir vlevel reboot help ? @ >
Show directory of Compact Flash Set Verbosity Level Reboot
Display general help or help about a command Display general help
or help about a command Boot the CMTS using current boot
parameters
End of procedure
Procedure 3-6
Setting Boot Parameters 1 Enter privileged mode using the enable
command to change the boot parameters. The first time you enter
this mode, there is no password set and you can enter with no
password. Use the setpwd command if a password is required in the
future. Several more commands are now available. Type ? to see the
entire list.>enable No supervisor level password set yet Use
"setpwd" command to set password Supervisor level enabled >?
---------------------------------------------------------------Command
Description
---------------------------------------------------------------boot
Boot the CMTS using current boot parameters bootShow Display
current boot parameters bootCfg Configure the boot parameters cf
Select Compact Flash for booting tftp Select TFTP for booting wan
Select FA0/0(WAN) port for network access mgmt Select FA0/1(MGMT)
port for network access enable Enable Supervisor/Factory Level
disable Disable Supervisor/Factory Level sysShow Show system
configuration setTime Set time in RTC setDate Set Date in RTC
timeShow Displays current Date and Time from RTC dir Show direcory
of Compact Flash setpwd Set password vlevel Set Verbosity Level
setVlanId Set the VLAN tag to be used vlanEnable Enable VLAN
tagging/stripping as set by setVlanId vlanDisable Disable VLAN
tagging/stripping reboot Reboot help Display general help or help
about a command ? Display general help or help about a command @
Boot the CMTS using current boot parameters >
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2 Decide what Ethernet interface to use for network access,
using the commands wan (to select FE0/0) or mgmt (to select FE0/1).
The bootShow command displays the selected interface as the Network
port as shown in the next step. Most CLI commands refer to the
FE0/0 port as fastethernet 0/0.0 and the FE0/1 port as fastethernet
0/1.0. If the CMTS has been booting from one interface and you
change this interface using the above commands, for the changed
factory default configuration to take effect, you need to erase the
old configuration using the CLI command write erase before entering
the boot options. Then, power cycle the CMTS to re-create the
startup configuration based on the new boot options. 3 Enter
bootShow to view the current boot options. (Note that the CMTS does
not show the TFTP server IP address unless BootCfg is selected as
following). A listing similar to the following displays:
C3>bootShow *** Current Boot Parameters *** Boot from : Compact
Flash Boot file : C:\4.4.0.38.bin CMTS IP Address : 10.1.127.121
CMTS subnet mask : 255.255.238.0 Gateway Address : 10.1.0.3 CMTS
Name : CMTS Network port : WAN Vlan Tagging : Disabled 4 If the C3
CMTS is to be managed over an 802.1Q VLAN, make the VLAN assignment
so that remote management systems can communicate with the C3 CMTS
during the boot process. This is also required if the C3 CMTS is
configured to boot using TFTP, since the TFTP transfer might use
the VLAN. Use the vlanEnable and setVlanId commands to set up the
VLAN. C3>vlanEnable C3>setVlanId 1 C3>bootShow *** Current
Boot Parameters *** Boot from : Compact Flash Boot file :
C:\4.4.0.38.bin CMTS IP Address : 10.1.127.121 CMTS subnet mask :
255.255.238.0 Gateway Address : 10.1.0.3 CMTS Name : CMTS
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Network port : WAN Vlan Tagging : Enabled Vlan Id : 1 (0x1)
C3> 5 To change the above list of boot options, enter bootCfg at
the command prompt. You can change the boot parameters one at a
time. Enter the new value for each parameter in turn to modify
them. Then enter bootShow to review the changes. Set the IP address
for the ARRIS Cadant C3 CMTS to suit your network. >bootCfg
Options: *[1] Boot from TFTP [2] Boot from Compact Flash Select
desired option : [2] Application Image path : [C:\4.4.0.38.bin]
CMTS Ip Address : [10.1.127.121] CMTS Subnet Mask : [255.255.128.0]
TFTP Server Ip Address : [] Gateway Ip Address : [10.1.0.3] Saving
in non-volatile storage >> Application Image path is the name
of the file and the file path if stored locally on the compact
flash disk that contains the code image to be loaded. Note that the
drive letter C is in UPPER CASE. Gateway Ip Address is the IP
address of the default router on the backbone network. The C3 CMTS
uses this IP address for TFTP server booting. 6 Once the boot
parameters have been modified as required, boot the system by
entering @ or boot at the prompt. Once the system is booted, the
serial port supports the CLI. When this is the first time the ARRIS
Cadant C3 CMTS has been powered up, the CMTS automatically creates
all of the required run time files from the specified image file.
The CMTS loads the image file and comes online. The following
output is representative of that generated on the console screen
during boot and initialization. *** Current Boot Parameters ***
Boot from : Compact Flash Boot file : C:\4.4.0.38.bin CMTS IP
Address : 10.1.127.121 CMTS subnet mask : 255.255.238.0 Gateway
Address : 10.1.0.3
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CMTS Name : CMTS Network port : WAN Vlan Tagging : Disabled
Attached TCP/IP interface to sbe0. Attaching network interface
lo0... done. . . . etc . . . ! No CLI accounts - Telnet is disabled
! Please configure a login account with the "cli account" command
Arris CMTS C3> End of procedure
Procedure 3-7
Configuring an Initial CLI Account You must create at least one
CLI account before the CMTS allows telnet access. Follow these
steps to create a CLI account. 1 If you have not done so already,
type enable to enter privileged mode. The prompt changes to a #
symbol. 2 Enter the following commands to create an account: C3#
configure terminal C3(config)# cli account {acctname} password
{passwd } The CMTS creates the account with the specified name and
password. 3 Enter the following command to give privileged (enable)
access to the account: C3(config)# cli account {acctname}
enable-password {enapasswd} C3(config)# exit The login password and
enable password may be the same if you prefer. End of procedure
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Procedure 3-8
Configuring the Network Time Protocol (optional) The C3 CMTS
optionally uses NTP to set its internal clock. You can configure
the NTP server IP address from the CLI using telnet or a serial
console once the application image is running. Follow these steps
to configure NTP, if desired. 1 Log into the CMTS, using the
account you created in the previous task. 2 Type enable to enter
privileged mode, and then type the enable password (set in the
previous task). 3 Enter the following commands to begin configuring
NTP: C3# config t C3(config-t)# ntp server {ntp_ip_addr} 4 Create a
timezone to specify the time offset from GMT: C3(config-t)# clock
timezone {name}{offset} Where name is the name of the time zone
(any string), and offset is the offset, in hours, from GMT.
Example: clock timezone EDT -4 5 Exit the global configuration mode
by typing exit or end. 6 Confirm the time settings: C3# show clock
7 Copy the running configuration to the startup configuration: C3#
copy running-config startup-config C3# write The CMTS stores the
new time settings in non-volatile memory. NOTE If NTP is not
available, set the internal clock using the clock set command.
End of procedure
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Configuring IP Networking
The C3 CMTS applies the CMTS IP address configured in the boot
parameters to the fastethernet interface selected as the boot
interface, and to the cable interface when booting from the default
configuration (or when no startup-configuration file is available).
If these settings are not suitable, use this procedure to specify
the IP address information required for normal C3 CMTS operation.
You should also specify at least one fastethernet sub-interface to
be available for system management; see management-access, page
11-235, for details.
Configuration Options
The C3 CMTS supports two configuration options: bridging (no IP
routing) modesee IP routing modesee
Chapter 4, Bridge Operation
Chapter 6, IP Routing
Default Bridge Groups Action
Depending on the boot interface you chose in Setting Boot
Parameters, page 3-13, the C3 CMTS pre-configures two bridge
groups. Perform one of the following tasks:
Configuring Bridging Mode, page 3-18 Configuring IP Routing
Mode, page 3-19
Procedure 3-9
Configuring Bridging Mode Follow these steps to configure a
different default route. 1 Log into the CMTS. 2 Enter one of the
following groups of commands: a To assign the management IP address
to the fastethernet 0/0.0 (FE0/0) primary sub-interface, enter the
following commands:
C3# config terminal C3(config)# interface fastethernet 0/0
C3(config-if)# ip address {mgmt-ip-addr} {mask} C3(config-if)# exit
C3(config)# exit C3# write
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b
To assign the management IP address to the fastethernet 0/1.0
(FE0/1) primary sub-interface, enter the following commands:
C3# config terminal C3(config)# interface fastethernet 0/1
C3(config-if)# ip address {mgmt-ip-addr} {mask} C3(config-if)# exit
C3(config)# exit C3# write 3 Enter the following commands to set
the default gateway IP address: C3# config terminal C3(config)# ip
default-gateway {gw_ip_addr} C3(config)# exit C3# write End of
procedure
Procedure 3-10
Configuring IP Routing Mode Follow these steps to the configure
the C3 CMTS for IP routing mode: 1 If IP routing is turned on while
a cable subinterface has the same IP address as a fastethernet
interface in the same bridge group, changing to pure IP routing is
not successful. Remove the cable interface IP address or change the
cable interface IP address before turning on IP routing mode. If
pure IP routing with no bridge groups is required, use step c;
otherwise, use steps a and b. a IP routing with bridge-group
memberships: C3# config terminal C3(config)# ip routing b Configure
the default route if necessary: C3# config terminal C3(config)# ip
route 0.0.0.0 0.0.0.0 {route} Where route = IP address of the
default route (or route of last resort)
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c
True IP routing, removing bridge-group memberships:
C3# config terminal C3(config)# ip routing C3(config)# interface
fastethernet 0/0.0 C3(config-if)# no bridge-group C3(config-if)#
interface cable 1/0.0 C3(config-if)# no bridge-group C3(config-if)#
interface fastethernet 0/1.0 C3(config-if)# no bridge-group
C3(config-if)# interface cable 1/0.1 C3(config-if)# no bridge-group
C3(config-if)# exit C3(config)# exit 2 Set the IP address of the
cable interface: C3(config)# interface cable 1/0.0 C3(config-if)#
ip address {cbl_ip} {subnet} The cbl_ip address may not be in the
same subnet as the management IP address. 3 Configure the DHCP
relay (this is required for a cable modem to register when the CMTS
is in IP routing mode): C3(config-if)# ip dhcp relay 4 Cable helper
address is mandatory for IP routing cable sub-interfaces that are
running DHCP relay. C3(interface)# cable helper-address {ipaddr}
C3(interface)# exit 5 Enter the following commands to save the
routing configuration: C3(config)# exit C3# write End of
procedure
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Configuring the Cable Interfaces
Use this procedure to configure and connect the cable upstreams
and downstream. Appendix B shows some example configurations.
Appendix F shows the factory default configuration. The factory
default configuration has the downstream in a shutdown condition so
the C3 CMTS is in a passive state by default.
Requirements Cable Connections
Connect the downstream and any upstreams in use before
performing this procedure. The following diagram shows the
locations of the cable connections on the rear panel of the C3
CMTS.Cable 1/0 Downstream FE0/0
Cable 1/0 Upstreams 0-5
Figure 3-8: Rear cable connections Action Perform the following
tasks in the order shown.
Configuring Downstream Parameters, page 3-21 Configuring
Upstream Parameters, page 3-22 Enabling the Interfaces, page
3-24
Procedure 3-11
Configuring Downstream Parameters Follow these steps to
configure the downstream cable interface. 1 Connect a PC to the
CMTS, using either the serial port or the Ethernet interface
(telnet connection). 2 Log into the CMTS. 3 Type enable to get into
privileged mode, and then type the enable password.
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4 Use the following commands to begin cable interface
configuration: C3# conf t C3(config)# interface cable 1/0 5 Set the
downstream frequency (in Hz) using the following command:
C3(config-if)# cable downstream frequency {freq} Example: cable
downstream frequency 501000000 6 Set the power level (in dBmV)
using the following command: C3(config-if)# cable downstream
power-level {pwr} Set the power level to match the parameters
assigned by the plant designer. Example: cable downstream
power-level 51 7 (optional) Set the DOCSIS mode using one of the
following commands: C3(config-if)# cable mac-mode {docsis}
C3(config-if)# cable mac-mode {euro-docsis} 8 (optional) Set the
downstream modulation type using one of the following commands:
C3(config-if)# cable downstream modulation 64qam C3(config-if)#
cable downstream modulation 256qam 9 Proceed to Configuring
Upstream Parameters, page 3-22. End of procedure
Procedure 3-12
Configuring Upstream Parameters Follow these steps to configure
each upstream cable interface. The parameter us refers to the
upstream interface ID, 0 to 5, corresponding to upstreams RX0
through RX5 on the back of the C3 CMTS. 1 Set the upstream mac-mode
using one of the following commands: C3(config-if)# cable mac-mode
{docsis} C3(config-if)# cable mac-mode {euro-docsis} 2 Set the
upstream channel type, using the following command: C3(config)if)#
cable upstream {X or X.Y physical or physical.logical} channel-type
{type} Where type is one of: tdma, atdma, tdma&atdma, or
scdma.
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NOTE All channel types for a particular channel must match the
modulation profile selected for that channel. If any channel type
does not match the modulation profile, the C3 CMTS disables that
channel until you correct either the channel type or modulation
profile. 3 Set the physical upstream channel width (in Hz) using
the following command: C3(config-if)# cable upstream {X or X.Y
physical or physical.logical} channel-width {width} The channel
width specified must be a DOCSIS-standard upstream channel width.
ATDMA: 6400000 (6.4 MHz) ATDMA and TDMA: 3200000 (3.2 MHz), 1600000
(1.6 MHz), 800000 (800 KHz), 400000 (400 KHz), or 200000 (200 KHz).
SCDMA: 1600000 (1.6 MHz), 3200000 (3.2 MHz), or 6400000 (6.4 MHz).
Example: cable upstream 2 channel-width 3200000 4 Set the physical
upstream channel frequency (in Hz) using the following command:
C3(config-if)# cable upstream {X or X.Y physical or
physical.logical} frequency {freq} The valid frequency range is
5000000 (5 MHz) to 42000000 (42 MHz) for North American DOCSIS, and
5000000 (5 MHz) to 65000000 (65 MHz) for EuroDOCSIS. Example: cable
upstream 2 frequency 25000000 5 Assign the modulation profile to an
upstream using the following command: C3(config-if)# cable upstream
{X or X.Y physical or physical.logical} modulation-profile {n}
Where n is a modulation profile index, 0 to 5. The factory default
modulation profile for each upstream is profile 1. This profile
uses QPSK and is the safest profile to use to get modems online. 6
Set the input power level (the target receive power set during the
DOCSIS ranging process) using the following command: C3(config-if)#
cable upstream {X or X.Y physical or physical.logical} power level
{power}
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The valid power range depends on the channel width; the range -4
to 14 is valid for all channel widths. See cable upstream
power-level, page 11-301 for individual ranges. Example: cable
upstream 2 power level 0 7 Repeat steps 2 through 5 for each
upstream that you need to configure. Proceed to Enabling the
Interfaces, page 3-24. End of procedure
Procedure 3-13
Enabling the Interfaces Follow these steps to enable the cable
interfaces. 1 Enable an upstream cable interface using the
following commands: For physical interfaces: no cable upstream [X
or X.Y physical or physical.logical] shutdown For logical
interfaces: no cable upstream [X or X.Y physical or
physical.logical] shutdown
Repeat this command for each configured upstream or logical
channel. 2 Enable the downstream cable interface using the
following command: C3(config-if)# no shutdown The CMTS is now ready
to acquire and register cable modems. To display the current CMTS
configuration, use the show running-config command. End of
procedure
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4
Bridge Operation
TopicsBridging Features Bridge Concepts Bridge Binding IP
Addressing Attaching Bridge Groups Incoming Traffic Allocation to a
Sub-Interface
Page3 4 14 16 18 19
The C3 CMTS supports IP bridging and routing modes of operation.
This chapter describes bridging mode. For more information, see:
Chapter 5, Providing Multiple ISP Access for information about
using bridge groups to separate traffic and provide cable modem
access to multiple ISPs. Chapter 6, IP Routing for information
about the C3 CMTSs optional IP routing mode.
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Terms and AbbreviationsThe following are terms and abbreviations
used in this chapter. booting interface The Fast Ethernet interface
specified in the boot options. Use the wan command to specify
fastethernet 0/0, or mgmt to specify fastethernet 0/1. bridge
binding Bridge binding maps a sub-interface A with VLAN tag a to a
sub-interface B with VLAN tag b; packets with tag a arriving on
subinterface A are immediately bridged to sub-interface B with tag
b, and vice-
versa. No other layer 2 bridging rules are followed.
bridge group A group of sub-interfaces that may forward (bridge)
packets to other sub-interfaces in the group. There is no
interaction between bridge groups at the MAC level. default cm
subinterface A designated sub-interface used for cable modem
traffic until the cable modem receives an IP address from a DHCP
server. default cpe sub-interface A designated sub-interface, used
as a source sub-interface for CPE traffic when it has no VLAN tag
or other explicit mapping (using the map-cpes command or VSE
method). native tagging Cisco routing nomenclature; sub-interfaces
using native tagging do not actually tag packets transmitted from
that sub-interface, but the tag number is still associated with the
sub-interface for internal processing purposes. routing
sub-interface A sub-interface that supports layer 3 routing. The
default sub-interface behavior is layer 2 bridging. sub-interface A
logical subdivision of a physical interface. The C3 CMTS supports
up to 250 sub-interfaces per physical interface. VLAN tag The VLAN
ID, used to associate a cable modem or CPE with a sub-interface.
The tag can be specified either in 802.1Q VLAN encapsulated
packets; or in native mode, in the cable modems VSE. VSE
Abbreviation for Vendor-Specific Encoding. The VSE is a TLV, stored
in the cable modem configuration file, that specifies the VLAN ID
used to associate the cable modems CPE with a sub-interface. During
modem registration, this information is passed to the CMTS allowing
the CMTS to map traffic through the modem to a nominated cable
subinterface with a matching native VLAN tag.
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Bridging FeaturesThe factory default operating mode of the C3
CMTS is bridging mode. In general, normal bridging operation should
not be assumed. In no configuration does bridging occur between the
two Fast Ethernet interfaces. Bridging between the FastEthernet
interfaces and the cable interfaces is controlled by: the selection
of the boot option network interface when no startup-configuration
file exists - the selection of the boot option network interface
when upgrading from release 2.0 to release 4.0 software - an
existing startup-configuration file; the configuration overrides
the boot options IP forwarding occurs even though the C3 CMTS is
running in bridging mode. IP forwarding between bridge groups is
turned off by default for security reasons. IP forwarding between
bridge groups (IP traffic allowed to leave a bridge group) may be
turned on using the command ip l2-bg-to-bgrouting in the interface
specification of any interface attached to the bridge group. Static
routes may be defined using the ip route command for: C3 CMTS
management traffic the DHCP relay agent IP forwarding between
bridge groups (using ip l2-bg-to-bgrouting) -
NOTE In bridging mode, other cable modem and CPE traffic should
be bridged and static routes should not be used.
NOTE Define a default gateway for the C3 CMTS using the command
ip default-gateway, page 11-175 from the CLI. A default gateway has
the same purposes and restrictions as a static route.
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Bridge ConceptsBridge Groups Bridge groups provide the ability
to operate self contained and separate MAC domains in one physical
device. A bridge group is defined as a group of interfaces attached
to a layer 2 bridge or a common broadcast domain.
BACKBONE
fastethernet 0/0.0 bridge-group 1
bridge 1
cable bridge-group 1
PC
BACKBONE
fastethernet 0/1.0 bridge-group 0
bridge 0
cable bridge-group 0
PC
Figure 4-1: Example of a bridge group When the C3 CMTS runs in
bridging mode, there is no interaction between bridge groups at the
MAC level or layer 2 levelwhether by ARP or any other protocol. The
problem with this concept is that although there are two physical
FastEthernet interfaces, allowing each to be assigned to a separate
bridge group, there is only one physical cable interface. This
issue is solved by the use of sub-interfaces.
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Sub-Interfaces
Sub-interfaces split a physical interface into multiple logical
interfaces to allow more flexibility in creating bridge groups.
This allows each sub-interface to have different specifications
for: bridge group membership IP addressing DHCP relay address
provided to the DHCP server DHCP relay mode and helper address IP
routing e.g. for RIP IGMP Filtering using both ACL and subscriber
management C3 CMTS management access 802.1Q tagging other layer 3
parameters
A sub-interface is specified using a dot notation as follows:
Cable 1/0.2 is a sub-interface of the physical interface cable 1/0.
Similarly FastEthernet 0/1.5 is a sub-interface of the FastEthernet
0/1 physical interface.BACKBONE
fastethernet 0/0.0 bridge-group 1
bridge 1
cable 1/0.1 bridge-group 1 PC default cpe subinterface cable
1/0.1
fastethernet 0/1.0 bridge-group 0Cable Operator
DHCP/TFTP/ToD
bridge 0
cable 1/0.0 Modem bridge-group 0 default cm subinterface cable
1/0.0
Figure 4-2: Example of a sub-interface to access different
bridge groups
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The C3 CMTS allows one sub-interface to be defined that is not a
member of any defined bridge group. This interface is marked as
Management Access Only in the show interface outputand as the
description suggests, this interface can only be used to manage the
CMTS.
BACKBONE
fastethernet 0/0.0 bridge-group 0 PC
bridge 0cable 1/0.0 Modem bridge-group 0 default cpe interface
cable 1/0.0 default cm interface cable 1/0.0
Management fastethernet 0/1.0
Figure 4-3: Example of a Management Access Only interface The
big issue with sub-interfaces is the decision making process of how
traffic is mapped from the physical interface to a sub-interface
for t